title: Evaluation of the antioxidant activity of Syzygium cumini leaves.
abstract: The antioxidant activity of Syzygium cumini leaf extracts was investigated using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical-scavenging and ferric-reducing antioxidant power (FRAP) assays. The methanolic extract and its four water, ethyl acetate, chloroform, and n-hexane fractions were prepared and subjected to antioxidant evaluation. The results showed that the ethyl acetate fraction had stronger antioxidant activity than the other ones. HPLC data indicated that S. cumini leaf extracts contained phenolic compounds, such as ferulic acid and catechin, responsible for their antioxidant activity. A significant linear relationship between antioxidant potency, free radical-scavenging ability and the content of phenolic compounds of leaf extracts supported this observation.
authors.affiliation: Key Lab of Ministry of Education for Coast and Wetland Ecosystems, Xiamen 361005, PR China. rzp20012001@yahoo.com.cn
authors.forename: Zhi Ping
authors.initials: ZP
authors.lastname: Ruan
authors.forename: Liang Liang
authors.initials: LL
authors.lastname: Zhang
authors.forename: Yi Ming
authors.initials: YM
authors.lastname: Lin
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D002851:Chromatography, High Pressure Liquid; D005290:Ferric Compounds / Q000737:chemistry; D016166:Free Radical Scavengers; D010636:Phenols / Q000032:analysis / Q000494:pharmacology; D010936:Plant Extracts; D018515:Plant Leaves / Q000737:chemistry*; D012997:Solvents; D027842:Syzygium / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D005290:Ferric Compounds; D016166:Free Radical Scavengers; D010636:Phenols; D010936:Plant Extracts; D012997:Solvents